期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 1, 页码 385-391出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c03371
关键词
-
类别
资金
- U.S. National Science Foundation [CHE-1565638, CHE-2035876]
- U.S. Army Research Office (ARO) [W911NF16-1-0152]
By using a semidefinite programming approach, improvements have been made in accurately describing strongly correlated and open shell systems in Kohn-Sham density functional theory, resulting in enhanced singlet-triplet gaps for local density approximation and generalized gradient approximation functionals. Additionally, flaws in modern meta and hybrid GGA functionals were revealed, showing no significant improvements even with accurate electron density provided.
Kohn-Sham density functional theory (DFT) has long struggled with the accurate description of strongly correlated and open shell systems, and improvements have been minor even in the newest hybrid functionals. In this Letter we treat the static correlation in DFT when frontier orbitals are degenerate by the means of using a semidefinite programming (SDP) approach to minimize the system energy as a function of the N-representable, non-idempotent 1-electron reduced density matrix. While showing greatly improved singlet-triplet gaps for local density approximation and generalized gradient approximation (GGA) functionals, the SDP procedure reveals flaws in modern meta and hybrid GGA functionals, which show no major improvements when provided with an accurate electron density.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据